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Finding the Fourth Proportional to 256,864.56, 385,257.96 and 69,890.64

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Solution

The fourth proportional to 256,864.56, 385,257.96 and 69,890.64 is: 104,825.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,864.56 : 385,257.96 = 69,890.64 : x
  2. Step 2: Convert to fraction form
    256,864.56/385,257.96 = 69,890.64/x
  3. Step 3: Cross multiply
    256,864.56x = 385,257.96 × 69,890.64
  4. Step 4: Simplify right side
    256,864.56x = 26,925,925,389.49
  5. Step 5: Solve for x
    x = 26,925,925,389.49/256,864.56
  6. Step 6: Final answer
    x = 104,825.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.